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. 2020 Jan 17;10:593. doi: 10.1038/s41598-020-57468-y

Table 2.

IBS patients and healthy subjects (HS) with indication of small intestinal bacterial overgrowth according to different glucose and lactulose breath test based definitions.

IBS (n = 17) HS (n = 20) p-value
Glucose Breath test
Fasting levels of H2 ≥ 15 ppm 2 3 >0.99
Fasting levels of CH4 ≥ 15 ppm 3 5 0.71
Rise of H2 or CH4 ≥ 20 above baseline within 90 min 0 0 N.A.
Lactulose Breath test
Fasting levels of H2 ≥ 15 ppm 1 3 0.61
Fasting levels of CH4 ≥ 15 ppm 1 3 0.61
Rise of H2 ≥ 20 ppm above baseline within 90 min 2 2 >0.99
Rise of CH4 ≥ 20 ppm above baseline within 90 min 1 0 0.44
Two distinct peaks of H2 or CH4 > 20 ppm 0 1 0.44

N.A. = Non applicable; HS = Healthy Subjects.